Display Panel Light Blocking Member for Transistor Inspection
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Solution Overview
Problem
In liquid crystal display (LCD) manufacturing, the Black Matrix On Array (BOA) technology makes it difficult to detect and repair defects in the channel between the source and drain electrodes of thin film transistors due to the presence of light blocking members on data lines and gate lines, which obscures visibility.
Innovation Solution
The solution involves forming a display panel with a light blocking member between color filters and pixel electrodes, but not on transistors, and using an opaque spacing part to maintain the cell gap between substrates, allowing for the formation of micro slits in pixel electrodes and enabling defect inspection and repair after pixel electrode formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light blocking members are formed on data lines and gate lines to prevent light leakage and photo current, then light leakage prevention is improved, but visibility of the channel between source and drain electrodes deteriorates
Solution Approach 1:
The patent extracts the light blocking function from the data lines and gate lines by forming a separate light blocking member only in the pixel area, leaving the channel area exposed. This separation allows the channel to remain visible for defect detection while the pixel area maintains light blocking to prevent photo current generation.
2Length of stationary object
If opaque spacing parts are formed on color filters to maintain cell gap, then cell gap maintenance is improved, but color filter thickness uniformity deteriorates
Solution Approach 1:
The patent applies local quality by forming the opaque spacing part only in specific regions where cell gap maintenance is critical, while keeping other color filter regions transparent and uniform. The opaque spacing part is strategically placed to provide mechanical support without compromising the overall color filter uniformity in the pixel area.
Data Source
AI summary
A display panel comprises a first substrate, a second substrate including a display area and a peripheral area surrounding the display area, a transistor layer including, formed in the display area of the substrate, at least one transistor connected to a gate line and a data line, at least one color filter formed in a plurality of pixel regions on the transistor layer, a light blocking member disposed between the color filters, at least one pixel electrode formed on the color filter, an opaque spacing part formed on the color filter corresponding to the transistor so as to maintain a cell gap between the first and second substrates. The light blocking member in some embodiments of the invention is not formed on the first and second transistors to allow for inspection of a channel in the transistor.